From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7D3C8C43381 for ; Thu, 28 Mar 2019 19:24:12 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4DDB6206B7 for ; Thu, 28 Mar 2019 19:24:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="KJNYu6UR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4DDB6206B7 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date:Message-ID:From: References:To:Subject:Reply-To:Cc:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=jzzf2yqajZxBS25ixpMq5VIklEEcz2OUNdPoWsQC8ZE=; b=KJNYu6URcakvYYw+6TB+cvfzs tFuaHNJmrSO9ONohvbJI4h4uNa4l6bYAAOi50m7uXwDqzy3Vovm0l0cr75a8z9qLjKUalK1Cy//s+ VZ+IXUwfEhTsoVWJndjWxxdgKWutfavNzaRKB/umxvnL0FaSdDApKj+Jkhj2vV1Uo281iIEYJ7cd5 ynQd08r4eL2Ncn1dnF0coLIqQty5gUgILvXwJ263vdq/FAA81qmhXWc77Gn6DfguSa/kI3ta1xf/y cyzB0nOJAM0Gu2FnGIBStKFsJVnQGbslnWBY9NShtGKau7KAHpY/ABQlh9Vd/r+Z+REYqrnz1vRqp s4U/TFl3w==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9adD-00068R-Dt; Thu, 28 Mar 2019 19:24:07 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h9ad9-00067S-Qo for linux-arm-kernel@lists.infradead.org; Thu, 28 Mar 2019 19:24:05 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8E17715AB; Thu, 28 Mar 2019 12:24:02 -0700 (PDT) Received: from [10.37.12.85] (unknown [10.37.12.85]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3248A3F614; Thu, 28 Mar 2019 12:24:00 -0700 (PDT) Subject: Re: [PATCH v3 2/2] coresight: funnel: Support static funnel To: leo.yan@linaro.org, mathieu.poirier@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, alexander.shishkin@linux.intel.com, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, shiwanglai@hisilicon.com References: <20190328023509.22242-1-leo.yan@linaro.org> <20190328023509.22242-3-leo.yan@linaro.org> From: Suzuki K Poulose Message-ID: <799f3f27-6a20-836e-b699-252ebb8e2fdf@arm.com> Date: Thu, 28 Mar 2019 19:26:16 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20190328023509.22242-3-leo.yan@linaro.org> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190328_122403_937379_83636049 X-CRM114-Status: GOOD ( 19.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 03/28/2019 02:35 AM, Leo Yan wrote: > Since CoreSight hardware topology can use a 'hidden' funnel in the > trace data path, this kind funnel doesn't have register for accessing > and is used by default from hardware design perspective. Below is an > example for related hardware topology: > > +------+ +------+ > | cpu0 |->| ETM |-\ > +------+ +------+ \-> +--------+ +-----+ > ...... | Funnel |->| ETF |-\ Hidden funnel > +------+ +------+ /-> +--------+ +-----+ \ | > | cpu3 |->| ETM |-/ \ V > +------+ +------+ \-> +--------+ > | Funnel |-> ... > +------+ +------+ /-> +--------+ > | cpu4 |->| ETM |-\ / > +------+ +------+ \-> +--------+ +-----+ / > ...... | Funnel |->| ETF |-/ > +------+ +------+ /-> +--------+ +-----+ > | cpu7 |->| ETM |-/ > +------+ +------+ > > The CoreSight funnel driver only supports dynamic funnel with > registration register resource, thus it cannot support for the static > funnel case and it's impossible to create trace data path for this case. > > This patch is to extend CoreSight funnel driver to support both for > static funnel and dynamic funnel. For the dynamic funnel it reuses the > code existed in the driver, for static funnel the driver will support > device probe if without providing register resource and the driver skips > registers accessing when detect the register base is NULL. > > Cc: Mathieu Poirier > Cc: Suzuki K Poulose > Cc: Wanglai Shi > Suggested-by: Suzuki K Poulose > Signed-off-by: Leo Yan Reviewed-by: Suzuki K Poulose _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel